Large Union Flag 1.5m X 90cm (5 X 3ft) Great Britain Uk English Union Jack Flag. Ideal for Pub, Bar, British Theme, Patriotic, Party, Soccer Etc by HDIUK. $6.90. Genuine from the United Kingdom. ideal for use on the front of a building, on a flag pole etc. Large 5 ft x 3 ft foot wide Union Flag. Large Union Jack flag 5ft x 3ft.